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  1. Hi,

    I have 1080i / 25 fps bluray and technical specifications is below.

    Code:
    Camera	Arriflex 435, Panavision Primo and Lightweight Lenses
    Panavision Panaflex Millennium XL2, Panavision Primo, Lightweight and Macro SM Lenses
    Laboratory	Technicolor, Montreal, Canada
    Negative Format	35 mm (Fuji Super F-64D 8522, Eterna 250D 8563, Eterna 500T 8573)
    Cinematographic Process	Digital Intermediate (2K) (master format)
    Spherical (source format)
    Printed Film Format	35 mm
    D-Cinema
    https://www.imdb.com/title/tt1650048/technical?ref_=tt_dt_spec

    What should I do for If I want to x264 encode? Yes I know 25fps is not Bluray compliant. Fps conversion is necessary and which way?
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  2. Originally Posted by max_cady View Post
    Hi,

    I have 1080i / 25 fps bluray and technical specifications is below.

    What should I do for If I want to x264 encode? Yes I know 25fps is not Bluray compliant. Fps conversion is necessary and which way?
    Where did you get this info from? 1080i25 is perfectly blu-ray compliant. Just encode it as interlaced with x264. It does it perfectly.
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  3. Originally Posted by Sharc View Post
    Where did you get this info from? 1080i25 is perfectly blu-ray compliant. Just encode it as interlaced with x264. It does it perfectly.
    According to the table below, if I interpreted correctly.

    https://forum.doom9.org/showthread.php?t=154533


    And movies shot for cinema are almost all 23.976 or 24 fps. So 25 fps is normal?
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  4. Member Cornucopia's Avatar
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    "Normal" for film-based material? No, but not unknown. And certainly fully allowable.

    Scott
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  5. Originally Posted by max_cady View Post
    Originally Posted by Sharc View Post
    Where did you get this info from? 1080i25 is perfectly blu-ray compliant. Just encode it as interlaced with x264. It does it perfectly.
    According to the table below, if I interpreted correctly.

    https://forum.doom9.org/showthread.php?t=154533


    And movies shot for cinema are almost all 23.976 or 24 fps. So 25 fps is normal?
    As you can see from the table:
    For primary video streams: 1080i25 16:9 (or pillar-boxed 4:3 footage) is blu-ray compliant
    For secondary video streams 1080i25 16:9 and 4:3 are blu-ray compliant

    The Arriflex 435 camera supports 1 - 150 frames per second according to its data sheet, hence it is well possible that the movie was originally shot at 25fps. IMDB has no more details about it, it seems.
    https://en.wikipedia.org/wiki/Arriflex_435

    True, most film productions were taken at 24fps.
    23.976fps (actually 24/1.001) is an NTSC TV compromise (for technical reasons), and 24fps films were simply slowed down to 23.976p for progressive DVD and Blu-ray (although blu-ray supports 24.0fps), and telecined to 30/1.001fps for NTSC TV / DVD.
    For PAL TV and PAL compliant DVDs, 24fps movies were often speed up from 24 to 25 fps and encoded as 25i, reducing the run-time accordingly. Some were telecined ("Euro-pulldown") to preserve the original duration.

    I don't know which route your movie has followed. It is well possible that 25fps is the original speed and encoded as (pillarboxed) 1080i25.

    Edit:
    Apparently this movie has originally been released at film festivals in European countries which supports the assumption that it has been shot at 25fps (for PAL/SECAM TV compliance).
    Last edited by Sharc; 10th Dec 2020 at 07:34.
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  6. Thank you both.
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